Working principle of pneumatic control valve

Installation principle of pneumatic control valve:

(1) The installation position of the pneumatic control valve shall be a certain height from the ground, and there shall be a certain space between the upper and lower parts of the valve, so as to facilitate the disassembly and repair of the valve. For the regulating valve equipped with pneumatic valve positioner and hand wheel, it must be easy to operate, observe and adjust.

(2) The regulating valve shall be installed on the horizontal pipeline and vertical to the pipeline. Generally, it shall be supported under the valve to ensure stability and reliability. For special occasions, when the regulating valve needs to be installed horizontally on the vertical pipeline, the regulating valve shall also be supported (except for small caliber regulating valve). During installation, additional stress shall be avoided to the regulating valve).

(3) The working environment temperature of the regulating valve shall be no more than 95% in (- 30 ~ + 60) relative humidity.

(4) There should be straight pipe section at the front and back of the regulating valve, with the length not less than 10 times of the pipe diameter (10d), so as to avoid the short straight pipe section of the valve affecting the flow characteristics.

(5) If the diameter of the regulating valve is different from that of the process pipe, the reducing pipe shall be used for connection. When installing the small caliber regulating valve, it can be connected with thread. The flow direction arrow on the valve body shall be consistent with the flow direction.

(6) To set the bypass pipe. The purpose is to facilitate switching or manual operation, and the control valve can be maintained without stopping.

(7) Before the installation of the regulating valve, the foreign matters in the pipeline, such as dirt, welding slag, etc., shall be completely removed.

working principle:

Pneumatic control valve is to use compressed air as power source, cylinder as actuator, and with the aid of electric valve positioner, converter, solenoid valve, position maintaining valve and other accessories to drive the valve, realize switch or proportional regulation, receive the control signal of industrial automation control system to complete the regulation of various process parameters of pipeline medium: flow, pressure, temperature, etc. Pneumatic control valve is characterized by simple control, fast response, and intrinsic safety, without additional explosion-proof measures.

Precautions for storage, installation and use

1. The valve shall be stored in a dry room, and both ends of the passage must be blocked. No stacking

2. The control valve stored for a long time shall be inspected regularly to remove the dirt, and each moving part and processing surface shall be coated with antirust oil to prevent rusting.

3. The valve shall be installed on the horizontal pipeline, and it is required to be installed vertically. Stem up.

4. It is required to install according to the flow direction of the medium indicated by the arrow in the figure